The delete_user action/hook can be used to perform additional actions when a user is deleted. For example, you can delete rows from custom tables created by a plugin.
The hook passes two parameters:
This hook runs before a user is deleted. The hook deleted_user (notice the "ed") runs after a user is deleted. Choose the appropriate hook for your needs. If you need access to user meta or fields from the user table, use delete_user.
Users deleted from Network Site installs may not trigger this hook. Be sure to use the wpmu_delete_user hook for those cases. The deleted_user hook is called in either case.
<?php add_action( 'delete_user', 'function_name' ); ?>
where "function_name" is the name of the function to be called.
Let's have a look at an example:
function my_delete_user( $user_id ) {
global $wpdb;
$user_obj = get_userdata( $user_id );
$email = $user_obj->user_email;
$headers = 'From: ' . get_bloginfo( "name" ) . ' <' . get_bloginfo( "admin_email" ) . '>' . "\r\n";
wp_mail( $email, 'You are being deleted, brah', 'Your account at ' . get_bloginfo("name") . ' is being deleted right now.', $headers );
}
add_action( 'delete_user', 'my_delete_user' );
In this example we send a friendly message to a user before their account is deleted a few milliseconds later.